New substances formed in a chemical reaction ___________________.

• A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
• New substances formed in a chemical reaction are called products.
• Substances that are undergoing chemical reactions are called reactants.
• Chemical reactions are represented in the form of the chemical equation.
• Reactants are present on the left-hand side of the chemical equation.
• Products are present on the right-hand side of the chemical equation.
• Example: Hydrogen(${\mathrm{H}}_2$) and Oxygen(${\mathrm{O}}_2$) combine to form water(${\mathrm{H}}_2\mathrm{O}$).
• Chemical equation:

$\underset{}{\underset{\mathrm{Reactant}1}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{Reatant}2}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\stackrel{}{\to }\underset{\mathrm{Product}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)}$

Therefore, new substances formed in a chemical reaction are called products.